untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

And there is evidence to back this — a Yale University review of insurance claims showed while 60% of women with significant symptoms of menopause seek treatment, almost 75% are left untreated. —Emma Burleigh, Fortune, 18 Oct. 2025

These modified beads were far better at avoiding immune responses compared to untreated nanoplastics. —Neetika Walter, Interesting Engineering, 17 Oct. 2025

For decades, leaders looked the other way as the Tijuana River Valley filled with trash, sediment and untreated wastewater. —Paloma Aguirre, San Diego Union-Tribune, 16 Oct. 2025

Left untreated, the condition is usually fatal in the first one to two years of life. —New Atlas, 16 Oct. 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease